quasar amplifier by dr bora 1000 watt - Page 7 - diyAudio
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Old 16th August 2012, 08:31 AM   #61
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Join Date: May 2005
Location: Cacak, Serbia
Nice results Joselito! Several people built it without any issues and it should work OK. What was the cause of your trouble with amp in the beginning? First you reported it is distorting and in a next post you are saying it sound nice and clear?!?!
Laonicus Chalcondyles : “Tryballos, Serbos, autem gentem esse totius orbis antiquissimam et maximam, compertum habeo...”
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Old 31st August 2012, 07:49 AM   #62
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Join Date: Oct 2010

The diode drawn is reverse or short circuit it should be otherwise.

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Old 31st August 2012, 08:30 AM   #63
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Join Date: Oct 2010
Sir Boraomega,

It was a power supply problem where my friend Edwin here had plugged the transformer to a 100 vac source instead of the 220 vac. With that condition the power amp is low voltage and perform poor with 1000 watt 8ohm load. With the right power source it drives the load strong and clear. Thank you for the brilliant design you shared to us.


I used the original IRFP240 specified by Sir Boraomega and had no chance of locating the IRFP460s. My friend Edwin now is also building one for him, he is not yet registered in the forum. Thanks

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Old 31st August 2012, 09:18 AM   #64
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Join Date: Sep 2003
Location: Slovenia
Default IRFP250


could you use IRFP250 instead of IRFP240? I have tons of IRFP250 available.


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Old 27th October 2013, 10:35 AM   #65
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Join Date: Oct 2013
Originally Posted by engel dela pena View Post
sir bora noted not to use irfp460 to me because of parasitic oscillation issue,what fets you use?
how do you implement the diode is this right?
pls see attachment
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